电工工作前要检查绝缘用具 -- 安全生产挂图9 Diangong gongzuoqian yao jiancha jueyuan yongju -- anquan shengchan guatu 9 Designer Li Shinan (李世南) Date 1964, December Publisher Jixie gongye chubanshe (机械工业出版社) Size 78x54 cm. Call nr. BG E15/526 Collection Landsberger collection